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Construction of an oilseed rape (Brassica napus L.) genetic map with SSR markers

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We constructed a Brassica napus genetic map with 240 simple sequence repeats (SSR) primer pairs from private and public origins. SSR, or microsatellites, are highly polymorphic and efficient markers for the analysis of plant genomes. Our selection of primer pairs corresponded to 305 genetic loci that we were able to map. In addition, we also used 52 sequence-characterized amplified region primer pairs corresponding to 58 loci that were developed in our lab. Genotyping was performed on six F2 populations, corresponding to a total of 574 F2 individual plants, obtained according to an unbalanced diallel cross design involving six parental lines. The resulting consensus map presented 19 linkage groups ranging from 46.2 to 276.5 cM, which we were able to name after the B. napus map available at, thus enabling the identification of the A genome linkage groups originating from the B. rapa ancestor and the C genome linkage groups originating from the B. oleracea ancestor in the amphidiploid genome of B. napus. Some homoeologous regions were identified between the A and the C genomes. This map could be used to identify more markers, which would eventually be linked to genes controlling important agronomic characters in rapeseed. Furthermore, considering the good genome coverage we obtained, together with an observed homogenous distribution of the loci across the genome, this map is a powerful tool to be used in marker-assisted breeding.

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The authors are grateful to Regine Delourme, from the UMR INRA ENSAR at Le Rheu, for giving us HD lines from the Darmor X Yudal population. We also thank Marika Seletti who gracefully accepted to review the English version of the manuscript.

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Correspondence to J. Piquemal.

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Communicated by H. C. Becker

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Piquemal, J., Cinquin, E., Couton, F. et al. Construction of an oilseed rape (Brassica napus L.) genetic map with SSR markers. Theor Appl Genet 111, 1514–1523 (2005).

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